Galvanized coating layer production line

ABSTRACT

A galvanized coating layer production line is disclosed. The production line comprises sequentially arranging, according to a workflow, a sand-blasting machine, a fluxing machine, a first air knife, a preheating device, a hot-dip bath, a second air knife, and a cooling chamber. The fluxing machine, the first air knife, the preheating device, the hot-dip bath, and the second air knife are each provided with a moving passageway through which a workpiece may pass; and disposed between the apparatus are rolling conveyors along which workpieces move. Rebar is able to lie flat as it moves one-by-one between the apparatus during the process. This allows for highly efficient production and for the electroplating of long rebar. The production line is easy both to expand and to improve.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a production line, and more particularly to a galvanized coating layer production line.

2. Description of the Prior Art

A coating production line is used for metal and non-metal to be coated with a protection layer or a decoration layer. The quality of coating will influence the appearance of the product and the capability of corrosion-resistance and weather-resistance. With the development of industrial technology, a coating line is developed from by hand to automation. The coating line is widely used in various fields. As shown in FIG. 7, a conventional galvanising coating production line comprises the process of pretreatment 1′, assisting plating 2′, preheating 3′, galvanising 4′, cooling 5′, and passivation 6′. It is operated by a suspension crane (or an electric hoist operated by hand) to hang workpieces (such as rebars). Because this conventional production line uses an electric hoist or a trolley conveyer to hang workpieces, the length of the workpieces to be electroplated is limited. For large-sized workpieces, the depth of the galvanising tank must be deep. As a result, the equipment is large in size, and the production efficiency is low.

Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a galvanized coating layer production line. The production efficiency is high. The electroplated rebars can be long.

In order to achieve the aforesaid object, the galvanized coating layer production line comprises a sand-blasting machine, a fluxing machine, a first air knife, a preheating device, a hot-dip bath, a second air knife, and a cooling chamber which are arranged sequentially according to a workflow. The fluxing machine, the first air knife, the preheating device, the hot-dip bath, and the second air knife are each provided with a moving passageway through which a workpiece can pass. Between the devices is provided with a rolling conveyer on which the workpiece run.

Preferably, the fluxing machine includes upper and lower rows of fluxing heads, and between the upper and lower rows of fluxing heads is the moving passageway for the workpiece to pass through the fluxing machine

Preferably, the first air knife and the second air knife have an identical structure. The first air knife comprises a triangular frame. An air wall of the triangular frame is provided with a plurality of air nozzles. A middle portion of the triangular frame is defined as the moving passageway for the workpiece to pass through the first air knife.

Preferably, the preheating device comprises a support, a guide pipe, and a heating wire. The guide pipe is installed on the support. The support is fixed on the ground. The heating wire is wound on the guide pipe. The guide pipe is provided with a plurality of guide holes. The guide holes are the moving passageway for the workpiece to pass through the preheating device.

Preferably, the hot-dip bath comprises a big bath, a small bath, and an electroplating solution circulatory system. The small bath is placed in the big bath. An upper portion of the small bath is beyond a top of the big bath. Two opposing walls of the small bath, beyond the big bath, are formed with through holes respectively. The through holes of the two opposing walls of the small bath are disposed at an axis. The through holes of the two opposing walls of the small bath are the moving passageway for the workpiece to pass through the hot-dip bath.

Preferably, between the sand-blasting machine and the fluxing machine, between the first air knife and the preheating device, between the preheating device and the hot-dip bath, between the second air knife and the cooling chamber is provided with the rolling conveyer on which the workpiece run.

As the fluxing machine, the first air knife, the preheating device, the hot-dip bath, and the second air knife are provided with the moving passageways through which workpieces can pass, rebars can lie flat and pass one-by-one through the devices in the order of workflow. The production efficiency is high, the electroplated rebars are long, and each device can be added or removed according to coating requirements. The production line is structurally compact, highly modular, and extension or improvement thereof is simple.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic view of the present invention;

FIG. 2 is a perspective schematic view of the fluxing machine of the present invention;

FIG. 3 is a perspective schematic view of the preheating of the present invention;

FIG. 4 is a perspective schematic view of the hot dip bath and the second air knife of the present invention;

FIG. 5 is a perspective schematic view of the cooling chamber of the present invention;

FIG. 6 is a schematic view of the working process of the present invention; and

FIG. 7 is a structural schematic view of a conventional galvanizing coating production line.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

As shown in FIG. 1, the present invention discloses a galvanized coating layer production line. The galvanized coating layer production line comprises a sand-blasting machine 1, a fluxing machine 2, a first air knife 3, a preheating device 4, a hot-dip bath 5, a second air knife 6, and a cooling chamber 7 which are arranged sequentially according to a workflow.

The fluxing machine 2, the first air knife 3, the preheating device 4, the hot-dip bath 5, and the second air knife 6 are each provided with a moving passageway through which a workpiece may pass. Between the sand-blasting machine 1 and the fluxing machine 2, between the first air knife 3 and the preheating device 4, between the preheating device 4 and the hot-dip bath 5, between the second air knife 6 and the cooling chamber 7 is provided with a rolling conveyer 8 on which the workpiece run.

As shown in FIG. 2, the fluxing machine 2 includes upper and lower rows of fluxing heads, namely, a row of upper fluxing heads 21 and a row of lower fluxing heads 22. Between the row of upper fluxing heads 21 and the row of lower fluxing heads 22 is the moving passageway for the workpiece to pass through the fluxing machine 2. In this embodiment, there are two fluxing machines 2.

As shown in FIG. 4, the first air knife 3 and the second air knife 6 have an identical structure. The second air knife 6 comprises a triangular frame 61 and an air pipe 62. An air wall of the triangular frame 62 is provided with a plurality of air nozzles 63. A middle portion of the triangular frame 61 is defined as the moving passageway for the workpiece to pass through the second air knife 6.

As shown in FIG. 3, the preheating device 4 comprises a support 41, a guide pipe 42, and a heating wire 43. The guide pipe 42 is installed on the support 41. The support 41 is fixed on the ground. The heating wire 43 is wound on the guide pipe 42. The guide pipe 42 is provided with a plurality of guide holes 421. The guide holes 421 are the moving passageway for the workpiece to pass through the preheating device 4.

As shown in FIG. 4, the hot-dip bath 5 comprises a big bath 51, a small bath 52, and an electroplating solution circulatory system 53. The small bath 52 is placed in the big bath 51. An upper portion of the small bath 52 is beyond a top of the big bath 51. Two opposing walls of the small bath 52, beyond the big bath 51, are formed with through holes 521, 522 respectively. The through holes 521, 522 of the two opposing walls of the small bath 52 are disposed at an axis. The through holes 521, 522 of the two opposing walls of the small bath 52 are the moving passageway for the workpiece to pass through the hot-dip bath 5.

As shown in FIG. 5, the cooling chamber 7 comprises an upper lid 7, a water tank 72, a plurality of shower heads 73, and a water inlet pipe 74. The water inlet pipe 74 is connected with a water source. The upper lid 71 is to cover the shower heads 73. The water tank 72 is installed on the ground and located under the shower heads 73.

As shown in FIG. 1 and FIG. 6, the working process of the present invention is that the workpiece (a rebar) 10 pass through the sand-blasting machine 1, the fluxing machine 2, the first air knife 3, the preheating device 4, the hot-dip bath 5, the second air knife 6, and the cooling chamber 7 sequentially. Finally, the processed workpiece 10 is collected on a rebar collection rack 9 disposed at the tail end of the production line. Each working process is controlled by a unified control electrical box. The specific steps are as follows:

1. the workpiece 10 passes through the sand-blasting machine 1 for removing oil and dust;

2. the workpiece 10 passes through the fluxing machine 2 and the first air knife 3 for applying a plating assistant agent evenly and drying so that electroplating solution can be adhered to the surface of the workpiece 10 effectively when electroplated;

3. the workpiece 10 passes through the preheating device 4 for drying the surface of the workpiece 10 by heat;

4. the workpiece 10 enters the hot-dip bath 5 from the through hole 521 of the wall of the hot-dip bath 5 for electroplating the surface of the workpiece 10;

5. the workpiece 10 passes through the second air knife 6 for drying and solidifying the electroplating solution on the surface of the workpiece 10; and

6. the workpiece 10 passes through the cooling chamber 7 for cooling and passivating to get the finished product, and the finished product is delivered to the rebar collection rack 9.

The feature of the present invention is that each apparatus is provided with a moving passageway through which the workpiece may pass. The aforesaid structure is just a preferred embodiment of the present invention. The length of the rolling conveyer can be changed according to the demand

Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims. 

What is claimed is:
 1. A galvanized coating layer production line, comprising a sand-blasting machine, a fluxing machine, a first air knife, a preheating device, a hot-dip bath, a second air knife, and a cooling chamber which are arranged sequentially according to a workflow; the fluxing machine, the first air knife, the preheating device, the hot-dip bath, and the second air knife being each provided with a moving passageway through which a workpiece passes; between the devices being provided with a rolling conveyer on which the workpiece run.
 2. The galvanized coating layer production line as claimed in claim 1, wherein the fluxing machine includes upper and lower rows of fluxing heads, and between the upper and lower rows of fluxing heads is the moving passageway for the workpiece to pass through the fluxing machine
 3. The galvanized coating layer production line as claimed in claim 1, wherein the first air knife and the second air knife have an identical structure, the first air knife comprises a triangular frame, an air wall of the triangular frame is provided with a plurality of air nozzles, a middle portion of the triangular frame is defined as the moving passageway for the workpiece to pass through the first air knife.
 4. The galvanized coating layer production line as claimed in claim 1, wherein the preheating device comprises a support, a guide pipe, and a heating wire, the guide pipe is installed on the support, the support is fixed on the ground, the heating wire is wound on the guide pipe, the guide pipe is provided with a plurality of guide holes, and the guide holes are the moving passageway for the workpiece to pass through the preheating device.
 5. The galvanized coating layer production line as claimed in claim 1, wherein the hot-dip bath comprises a big bath, a small bath, and an electroplating solution circulatory system, the small bath is placed in the big bath, an upper portion of the small bath is beyond a top of the big bath, two opposing walls of the small bath, beyond the big bath, are formed with through holes respectively, the through holes of the two opposing walls of the small bath are disposed at an axis, and the through holes of the two opposing walls of the small bath are the moving passageway for the workpiece to pass through the hot-dip bath.
 6. The galvanized coating layer production line as claimed in claim 1, wherein between the sand-blasting machine and the fluxing machine, between the first air knife and the preheating device, between the preheating device and the hot-dip bath, between the second air knife and the cooling chamber is provided with the rolling conveyer on which the workpiece run. 